Shane Huang wrote:
1. If users unplug one SATA HDD(no-root partition) or SATA ODD when
the system is running, then plug it back to the same SATA port,
Should the system and SATA HDD/ODD still work well?
Yes.
2. How about users plug the SATA HDD/ODD in a different SATA port?
Should it still work?
Yes.
For all hotplug-aware libata drivers, you should be able to unplug a
SATA device _while_ it is actively reading or writing data, with no ill
effects to the kernel.
You might lose cached and in-flight data of course, and userspace
applications may or may not handle the disappearance of their underlying
filesystem with grace and aplomb :)
But device hotplug should be reliable from a kernel standpoint [assuming
driver support].
These questions come up when our QA test our SB700 SATA drivers,
but I don't know the SATA hotplug support in linux 2.6.
Is there any guy who can give some official confirmation? :-)
The main thing of note with regards to hotplug is that the associated
device (/dev/sdb, /dev/scd0, etc.) may change between plug and unplug.
For example, if you unplug a SATA HDD then plug it back in, the user
might see /dev/sdb disappear, and /dev/sdd appear -- even if it is the
exact same HDD, on the exact same port.
Jeff
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